The ECC803S Gold is a long plate type ECC83 which is a prefered detail when concerning the use in hi-fi audio equipement.
The long plate construction does allow a higher peak current which is especcially helpful as driver tube.
With the BALANCED / SYMMETRIC selected option it is a recommended choice as balanced driver stage
The MATCHED PAIR selected option includes (of course) the selection for BALANCE and is the recommended choice for Stereo amplifiers.
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